DESCRIPTION

The pthread_condattr_getclock() function shall obtain the value of the clock attribute from the attributes object
referenced by attr. The pthread_condattr_setclock() function shall set the clock attribute in an initialized
attributes object referenced by attr. If pthread_condattr_setclock() is called with a clock_id argument that
refers to a CPU-time clock, the call shall fail.

The clock attribute is the clock ID of the clock that shall be used to measure the timeout service of pthread_cond_timedwait(). The default value of the clock attribute
shall refer to the system clock.

RETURN VALUE

If successful, the pthread_condattr_getclock() function shall return zero and store the value of the clock attribute of
attr into the object referenced by the clock_id argument. Otherwise, an error number shall be returned to indicate
the error.

If successful, the pthread_condattr_setclock() function shall return zero; otherwise, an error number shall be returned
to indicate the error.

ERRORS

These functions may fail if:

[EINVAL]

The value specified by attr is invalid.

The pthread_condattr_setclock() function may fail if:

[EINVAL]

The value specified by clock_id does not refer to a known clock, or is a CPU-time clock.